Roll you own Ubuntu flavors with Reconstructor.

Reconstructor is an Ubuntu GNU/Linux CD Creator.It uses the Desktop(Live), Alternate(Install), or Server disc as a base, and then allows for user customization.For the Ubuntu Desktop base, you can customize the entire environment. For instance, you can add/remove software, change the default look (splash, themes, fonts, wallpaper, etc.), add desktop links, etc.

For the Alternate and Server bases, you can add any additional software to the disc that you would like installed.

Reconstructor is written in python and is licensed under the GNU General Public License (GPL).